High-resolution carbon isotope record for the Paleocene-Eocene thermal maximum from the Nanyang Basin,Central China  

作　　者：ZHU Min DINGZhongLi WANG Xu CHEN ZuoLing JIANG HanChao DONG XinXin JI JunLiang TANG ZiHua LUO Pan 

机构地区：[1]Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Be ijing 100029, China [2]The Graduate University of Chinese Academy of Sciences, Beifing 100049, China [3]State-Key Laboratory-ofEarthquake Dynamics, Jlnstitute of Geoiogy, China Earthquake Administration, Beijing 100029, China [4]Key Laboratory of Biogeology and Environmental Geology, Ministry of Education, China University ofGeosciences, Wuhan 430074, China

出　　处：《Chinese Science Bulletin》2010年第31期3606-3611,共6页

基　　金：supported by the National Natural Science Foundation of China (40730208)

摘　　要：古新始新世的热最大值(PETM ) 是全球温暖的一个短暂事件，与发生在古新 / 始新世的边界的巨大的大气的温室气体输入联系了。Biostratigraphic 和同位素 stratigraphic 研究显示 PETM 事件很好在 Nanyang 盆在 Yuhuangding 节的泥土存款被记录，华中，与碳同位素，在 19-m-thick 泥土以内的锝 ?.1 鈥 ? 的否定旅行扔。这是到目前为止在世界上发现的 PETM 的最高的分辨率记录。PETM 事件在 2-cm-thick 泥土沉积以内被触发，与未 1 3C (稳定的碳同位素比率) 从的减少 ? 3.2 鈥 ? 到 ? 5.2 鈥吗？为是的一个短暂时期建议一个巨大的甲烷水合物版本可能由一个灾难的事件引起了。在海洋、陆上的记录之间的比较为 PETM 事件显示鈥淭h ree 阶段模型鈥 ? 。开始在未 1 3C 记录有一次快速的否定旅行，由一个慢慢地减少的趋势，然后渐渐的积极恢复列在后面，相应分别地到海洋的甲烷水合物的快速的分离，由甲烷然后释放甲烷的消费的一个慢版本列在后面。The Paleocene-Eocene thermal maximum （PETM） was a transient episode of global warming, associated with massive atmos- pheric greenhouse gas input that occurred at the Paleocene/Eocene boundary. Biostratigraphic and isotope stratigraphic studies indicate that the PETM event is well documented in the marl deposits of the Yuhuangding section in the Nanyang Basin, Central China, with a carbon isotope negative excursion of -6.1‰ within 19-m-thick marl deposits. This is the highest resolution record of the PETM so far found in the world. The PETM event was triggered within 2-cm-thick marl sediments, with a decrease of δ13C （stable carbon isotope ratio） from -3.2‰ to -5.2‰, suggesting a massive methane hydrate release for a transient period that was possibly caused by a catastrophic event. A comparison between marine and terrestrial records indicates a ＂Three-Phase Model＂ for the PETM event. Initially there is a rapid negative excursion in the δ13C record, followed by a slowly decreasing trend, and then a gradual positive recovery, corresponding respectively to a rapid dissociation of oceanic methane hydrate, followed by a slow release of methane and then the consumption of the released methane.

关 键 词：碳同位素 高分辨率 南阳盆地 古新世 始新世 同位素记录 中国 甲烷水合物 

分 类 号：P618.130.1[天文地球—矿床学] S562.02[天文地球—地质学]